Arsene Wenger has admitted that Alexandre Lacazette's absence until late March at the earliest is a massive blow for Arsenal.
Lacazette faces a spell on the sidelines after having a "minor" operation on his left knee.
The former Lyon striker has scored just two goals since the start of December and Wenger has suggested that the knee problem may have led to Lacazette's poor recent form.
"He got a surprising swell of the knee after the game against Tottenham and needed surgery, very quick surgery, and he will be out for the next four or five weeks," Wenger confirmed. "It's a massive blow for us, but we have to find a solution.
"Nobody could predict that, but football is as well to do with unpredicted things and it's always a good opportunity to find someone who steps in and does well.
"Lacazette is down, but I think he recently must have felt something in his knee, I don't know. Maybe as well that's an explanation why he was not scoring as many goals as he's used to."
Arsenal are 12121/1 to win the Europa League this season and 1500/1 to finish in the top four of the Premier League while they can be backed at 9/20 to beat Ostersunds FK v Arsenal on Thursday.
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